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Finding the Fourth Proportional to 788.40, 1,087.94 and 439.08

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Solution

The fourth proportional to 788.40, 1,087.94 and 439.08 is: 605.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.40 : 1,087.94 = 439.08 : x
  2. Step 2: Convert to fraction form
    788.40/1,087.94 = 439.08/x
  3. Step 3: Cross multiply
    788.40x = 1,087.94 × 439.08
  4. Step 4: Simplify right side
    788.40x = 477,692.70
  5. Step 5: Solve for x
    x = 477,692.70/788.40
  6. Step 6: Final answer
    x = 605.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.